6 1 3 (- 7 2 9 July 8, 2019 16 32 64 128 1 3 3х 6 )- 2 7 7х 21 )= 9 1 3 3x 6 )- 2 7 7x 21 )= 9 6 7 9 3 1 2 in fraction form
